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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Assets and Liabilities) (Details) - Recurring basis - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Assets | $ 21,745 | $ 45,613
Cash and cash equivalents |  |
Assets: |  |
Money market funds | 18,530 | 42,470
Other long-term assets |  |
Assets: |  |
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan | 2,864 | 2,342
Interest rate swaps | 351 | 801
Accrued and other long term liabilities |  |
Liabilities: |  |
Contingent consideration |  | 4,472
Level 1 |  |
Assets: |  |
Assets | 21,394 | 44,812
Level 1 | Cash and cash equivalents |  |
Assets: |  |
Money market funds | 18,530 | 42,470
Level 1 | Other long-term assets |  |
Assets: |  |
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan | 2,864 | 2,342
Level 2 |  |
Assets: |  |
Assets | 351 | 801
Level 2 | Other long-term assets |  |
Assets: |  |
Interest rate swaps | $ 351 | 801
Level 3 | Accrued and other long term liabilities |  |
Liabilities: |  |
Contingent consideration |  | $ 4,472

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